Rotary pump.



D. G. BAKERK: H. P. HANSEN.

BOTARY PUMP. APPLICATION FILED MAR. 12, 1912.

1,038,477. Patented Sept. 10,1912.

2 SHEETS-SHEET 1.

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D. G. BAKER 6: H. F. HANSEN.

ROTARY PUMP.

APPLICATION FILED MAR. 12, 1912.

Patented Sept. 10, 1912.

2 SHEETS-SHEET 2.

DEiTER G. BAKER HARVEY'F. HANSEN, OF SAN JOSE, CALIFORNIA.

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Specification of Letters Patent.

Patented Sept. 10, 1912.

Application filed March 12, 1912. Serial No. 683,891.

To all whom it may concern 7 Be it known that we, DEXTER C. BAKER and HARVEY F. HANSEN, citizens of the United States, residing at San Jose, in the county of Santa Clara and State of California, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

This invention relates to rotary pumps, of that type embodying a rotary piston having blades or vanes disposed eccentrically in a chamber provided with an inlet or intake at one side and an outlet or discharge at the opposite side.

The main object of this invention is to provide an improved rotary pump of this kind, so constructed and arranged as to relieve the sliding blades of the piston from resistance occasioned by air or liquid compression so that they will operate and thereby be unrestricted in their recessional movement and permit continuous rotation of the piston.

The invention consists of the construction and arrangement of the several parts which will be more fully hereinafter described and claimed.

In the drawings :Figure 1 is an end elevation of the pump showing parts of the same removed; Fig. 2 is a cross section through the complete pump Fig. 3 is a longitudinal section through t e center of the and Fig. 4 is an end elevation of the of the heads removed.

pump with one a cylinder or The numeral 5 designates drum of suitable dimensions having 'opposite removable heads 6, provided with outwardly projecting sleeve bearings 7, terminally engaged by packing caps 8. The cylinder 5 and heads 6 inclose a chamber 9 and eccentrically extending therethrough and through the bearings 7 and caps 8 is a shaft 10 which may be of any suitable length and in practice will be equipped with a preferred form of power transmittin device such as a band pulley; A rotary piston 11 is keyed on the shaft 10 and formed with a plurality of radial slots 12 opening out through its periphery, but inwardly terminating at a distance outwardly from the center of the piston. The inner ends of the slots 12 communicate with a corresponding plurality of cross bores or cylindrical channels 13 opening out through theopposite ends or faces of the piston. The outer terminals of the slots 12 enter clearance grooves or channels 14 for the blades or vanes 15 mounted in the-slots and whereby the blades may be automatically projected in regular .sequence without the least resistance from accumulations at the outer ends of the said slots 12.

On the opposite faces of the rotary piston 11 disks or circular plates 16 are secured by suitable fastenings such as screws 17, having their heads seated in annular grooves 18 formed in the outer sides of the disks. These grooves 18 also provide center bosses 19 which are bored to form apertures 20, registering with the bores 13. The disks or circular plates 16 rotate with the piston 11 and bear on the inner surfaces of lower oflsets 21 of the heads 6 to fully expose the periphery of the piston to the lower portion of the chamber 9 to give free action of the blades or vanes 15 and at the same time provide a tight fitting or non-leakable jointurebetween the piston and adjacent walls of the chamber 9 at the working location of the blades and remove wear from the piston periphery direct. The centers of the heads 6 are also oflset outwardly a greater distance than the offsets 21, as at 22, .to form annular chambers 23 with the bosses 19, and

mounted in these chambers and disposed loosely over oppositeportions of the shaft 10 are fixed valve disks 24 held against the bosses 19 by coiled springs\ 25 interposed between the said valve disks and the inner surfaces of the walls of the olfset centers 22, the said springs operating to maintain a close-contact of the valve disks with the bosses 19. The valve disks are formed with a plurality of openings 26 in their lower portions adapted to register the apertures or openings 20 in the bosses 19, during rotation of the latter and the piston 11. To hold the valve disks 24 in fixed position, pins 27 project inwardly from the oifset centers 22 of the heads 6 and enter the said valve disks above the plane of the shaft 10.

Communicatingv with the upper portions .of the chambers 23 are vertical ducts 28, see

Fig. 2, connected by an upper cross duct 29,

with a vertical duct 30 centrally intersecting the same and terminating at the inner chammunication with the chamber 9 which has an inlet or intake 33 at an opposite pomt,

the inlet or intake and outlet both cooperatportionv of thecylinde'r or drum 5 an air 110 central ber 31 of a discharge 32, and thereby incomchamber or dome 34 is mounted and opens at its lower end through a port or passage 35 to the cross duct 29.

It will be understood that water or a fluid pressure medium, as may be desired, passing through the inlet 33 enters chamber 9 and engages the projected blades or vanes 15 in succession and rotates the piston 11 and passes out through the discharge 32. In pumps of this type the blades in the piston are frequently retarded in their action during inward movement into theiston with the result that the outer ends 0 the blades become worn, and owing to frictional resist ance set up by irregular contact of the blades with'the wall of the chamber in whichthey rotate, the. piston is checked to a considerable degree with obvious disadvantages in the practical operation of the pumps. In the present construction the air that may accumulate adjacent to the'inner ends of theblades 15 is driven or forced into the bores or cylindrical chambers 13 and from the latter escapes through the apertures 20 of the bosses 19 and openings 26 of the valve disks .24 into the chambers 23 and then passes out through the ducts 28 into the duct 29 and through the outlet duct 30 into chamber 31 and sequently into the piston chamber 9 and has egress through the outlet or discharge 32. y The air is compressed in chamber 34 instead of being drawn down duct 30.

32 is the discharge of pump and the pressure the pump is working against is backed up conduit 30. o

, The pressure of the discharge end, whether it is one, "or one hundred pounds to the square inoh,-g'oes up conduit 30 and down conduit 28 and into chamber 22 back'of v valve disks 24, through openings 20 and under the sliding pistons to 'force them out against the cylinder wall at the outer end of the sliding pistons. The liquid betweenthe' sliding pistons in chamber 9 is trying to. bypas's the outer ends of sliding pistons when pump is in action. The pressure acting on-inner end of the pistons balances the former. 1

The flmction of the air chamber is to balance the pressure in the conduits 28, 29, 30 and' the cylindrical chambers 22, it being understood that the receding of the pistons when approaching the exhaust passage'32 and after passing the exhaust causes the air behindthe piston'to be forced into the chambers 22 and from thence into the conduits 28, 30 and into the air chamber or dome 34, some of the pressure, however, being taken up by supplying air behind the pistons on modifications in the proportions and dimensions will be adopted at will to compensate or accommodate various uses and applications.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is 1. In a pump, a cylinder having a chamber therein, a rotary piston mounted in said chamber and having sliding bladesand inher air or liquid chambers to supply the blades with liquid or air pressure at-their inner ends, center chambers at opposite ends of the piston valvedisks held against rotation in the center chambers and having openings to establish communication between the air or liquid chambers of the piston and said center chambers as the piston; rotates, and air or liquid supply ducts 1ead ing from said center chambers, and having outlet into the discharge line. 2. In a rotary pump, the combination of a cylinder, having a piston chamber, a 1'0- tary piston mounted in said chamber and formed with radial slots having air or liquidchambers at their inner terminals, center,

chambers at opposite ends of the piston,

valve disks held against rotation in the cen-' ter chambers and provided with lower open-r ings to establish communication between thelatter chambers and the'air or liquid fc'hambers of the piston, a shaft extending thin 11' the piston and valveidisks, inlet 'andout et.

means communicating with o posite po r tions of the lower, portion 0 the piston chamber, and duct-s and-an air chamber in continual communication .with the center chambers and the inner portion of thedischarge meanspandpiston chamber.

In testimony whereof we aflix our signatures in presence of two witnesses.-

DEXTER O. BAKER, HARVEY F. HANSEN. Witnesses:

WM. H. Rooms, F. H. BLOOMINGDALE.

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